Answer
$4x(x-5)(x+5)$
Work Step by Step
$ 4x^{3}-100x\qquad$...factor out the GCF, $4x$.
$=4x(x^{2}-25)\qquad$...recognize the difference of two squares: $a^{2}-b^{2}=(a-b)(a+b)$
$=4x(x-5)(x+5)$
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